WO2011161003A2 - Câble d'acier appliqué en couches à noyau alternatif - Google Patents

Câble d'acier appliqué en couches à noyau alternatif Download PDF

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Publication number
WO2011161003A2
WO2011161003A2 PCT/EP2011/060051 EP2011060051W WO2011161003A2 WO 2011161003 A2 WO2011161003 A2 WO 2011161003A2 EP 2011060051 W EP2011060051 W EP 2011060051W WO 2011161003 A2 WO2011161003 A2 WO 2011161003A2
Authority
WO
WIPO (PCT)
Prior art keywords
filaments
filament
steel cord
inner strand
core
Prior art date
Application number
PCT/EP2011/060051
Other languages
English (en)
Other versions
WO2011161003A3 (fr
Inventor
Zhichao Cheng
Aijun Zhang
Pengfei Wang
Lei Pan
Original Assignee
Nv Bekaert Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nv Bekaert Sa filed Critical Nv Bekaert Sa
Publication of WO2011161003A2 publication Critical patent/WO2011161003A2/fr
Publication of WO2011161003A3 publication Critical patent/WO2011161003A3/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D07B1/064—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords being twisted and with at least one wire exchanging place with another wire
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/0646—Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2011—Wires or filaments characterised by a coating comprising metals
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D07B2201/2031—Different twist pitch
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3046—Steel characterised by the carbon content
    • D07B2205/3053—Steel characterised by the carbon content having a medium carbon content, e.g. greater than 0,5 percent and lower than 0.8 percent respectively HT wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3071—Zinc (Zn)
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3085—Alloys, i.e. non ferrous
    • D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tyre cords

Definitions

  • the present invention relates to a steel cord with an inner strand and a layer.
  • the invention also relates to a method of manufacturing such a steel cord and to the use of such a steel cord.
  • the core filament may risk protruding out of the cord and out of the rubber tire.
  • JP-A-08-049177 discloses a steel cord of three to six filaments where one of the filaments is alternatingly taking the position of the center.
  • this steel cord as reinforcement for the belt or breaker ply of a truck tire leads to processability problems in a steelastic installation. These problems are due to the rough and unequal outer surface of the steel cord. Indeed, the rough and unequal surfaces of various cords lying closely and parallel next to each other before entering the steelastic installation, may cause sleeving or bird caging.
  • WO 95/16816 discloses a preformation on the filament.
  • the filament is polygonally preformed to get different curve with different curvature radius perpendicular to the longitudinal axis along the length of the filament.
  • the convex curve allows for rubber penetration between the individual filaments within a strand.
  • the rubber penetration has improved significantly.
  • the solution turned out to be very successful in the field of tyre reinforcement regarding fatigue improvement and corrosion prevention.
  • the polygonally deformed filament helps to better core anchorage, further to prevent core migration and is not found in the prior art type of cords of this application.
  • a steel cord for reinforcing rubber products comprises an inner strand of at least three and no more than seven filaments twisted together in a first twist direction with a first twist step and further comprises a layer of filaments twisted around the inner strand in a second twist direction with a second twist step; one of the filaments of the inner strand alternatingly takes the position as core filament.
  • the outer layer provides an outer surface with a
  • the invention relates to a steel cord for the reinforcement of rubber products, such as a truck or bus tire, more particularly the breaker ply or belt layer in a bus or truck tire.
  • the steel cord has a core filament.
  • Two to six sheath filaments surround this core filament and an outer layer of filaments surround the sheath filaments.
  • one of the two to six filaments changes its position with the core filament.
  • At least one filament in the inner strand is polygonally preformed before being twisted into the steel cord for not only good rubber penetration but also better core anchorage.
  • two or three of the filaments are polygonally preformed or all of the filaments in the inner strand are polygonally preformed.
  • WO 95/16816 discloses the polygonally preformed steel filament.
  • Polygonal performing is a preformation which gives the steel filament projections on a plane perpendicular to the longitudinal central axis.
  • the projections are in the form of curves which are convex curves with a radius of curvature alternating between a maximum and a minimum.
  • the radius of the curvature of the preformed steel filament alternates between two extremes: a minimum at the point where the highest bending has been given and a maximum at the point where the smallest bending has been given.
  • a device to manufacture such a preformed steel filament comprises a
  • the body having a central axis and a circumferential surface.
  • the body is rotatable around its central axis when a strength element is drawn over an angle of at least 90° over its circumferential surface.
  • the circumferential surface has a radius of curvature which alternates between a maximum and a minimum so as to give to the strength element which passes over it a curve with a radius of curvature which alternates between a maximum and a minimum.
  • the steel cord according to the invention consists of six
  • filaments with at least one filament polygonally preformed in the inner strand and twelve filaments twisted around the inner strand.
  • the diameter of the filaments in the outer layer is less than or equal to the diameter of the filaments in the inner strand.
  • the thicker inner filaments open the outer layer so that rubber can reach the inner and thereby fix the inner filaments by means of the adhesion that occurs between the rubber and the adherent coating of the inner filaments.
  • the first twist step there is no specified core filament while in the second twist step, the inner strand acted as the core and the twelve filaments as a layer twisted around it.
  • the second twist direction is the same as the first twist direction.
  • each filament of the inner strand takes the position as core filament in a fixed order. I.e., each filament of the inner strand would take the position as core filament again after five other sheath filaments are all pushed in the center and went out in turn. That means each filament is exchanged from the sheath to the core one by one by the same technique and a series of substitution of the core filament is completed.
  • the order in which the filaments from the inner strand take the position of core filament can also be at random.
  • a process to manufacture the cord comprises the standard step used for the production of single lay cords as known in the art but has been adapted with certain inventive features.
  • a number of spools on length are provided with the steel filaments of the respective diameters on them.
  • the filaments in the inner strand are twisted together by a rotary assembly machine.
  • the three to seven filaments are deposited towards a first cabling point thus forming an inner strand.
  • the steel cord may be used in the breaker or in the belt layer of pneumatic radial tires, and particularly useful for use in truck tires.
  • Figurel a, Figure 1 b, and Figure 1 c show different cross sections along the length of a first embodiment of the inventive cord.
  • Figure 2a and Figure 2b show respectively a longitudinal view and a
  • Figure 3a and Figure 3b show different cross sections along the length of a second embodiment of the inventive cord.
  • FIG. 1 a and Figure 1 b and Figure 1 c are cross sections from such a cord taken at different places along the cord.
  • the filament of a core replaces the filament of a sheath, namely, the filament which forms a core is not specified.
  • the filament 22a As one of the filaments 22a is pushed towards the center as core filament when five filaments surround the core at a lay of 14 mm. Such a configuration is inherently unstable as the filament 22a in the center will try to move out; consequently, another filament, such as 22c, will be compelled to get into the centre. Therefore, the filament 22c will take the position as core filament and the filament 22a will act as one of the sheath filaments temporarily.
  • the filament 22c can nest on turn in the center at a length of 3-5 cm and then another sheath filament such as 22e will take the position as core filament at the same way.
  • a steel cord 20 with an inner strand and an outer layer according to the invention was built as follows.
  • Starting product is a steel wire rod.
  • This steel wire rod has following steel composition: A minimum carbon content of 0.65%, a manganese content ranging from 0.40% to 0.70%, a silicon content ranging from 0.15% to 0.30%, a maximum sulphur content of 0.03%, a maximum phosphorus content of 0.30%, all percentages being percentages by weight.
  • a typical steel tire cord composition for high-tensile steel cord has a minimum carbon content of around 0.80 weight %, e.g. 0.78 - 0.82 weight %.
  • the steel rod is drawn in a number of consecutive steps until the required final diameter.
  • the round diameter for the filaments in the inner strand is 0.245 mm and 0.235 mm for the steel filaments in the layer.
  • the drawing steps may be interrupted by one or more heat treatment steps such as patenting.
  • the steel filaments are preferably provided with a coating which promotes the adhesion to rubber or with a coating which gives corrosion resistance to the wire.
  • a rubber adherable coating is e.g. brass; a corrosion resistant coating is e.g. zinc.
  • the filaments are end drawn to their final diameter and are subjected to a twisting operation as described above.
  • the diameter was 1 .23 mm with a fairly high difference between maximum and minimum diameter of 0.01 mm
  • the mass per meter was 6.52 gram/m and a breaking strength 2730 N with an elongation of 2.72% was found.
  • Prior art cord No.1 is a normal three layered structure cord 1 +6+12 with core filament diameter and the inner layer diameters equal to 0.245 mm and the outer layer filaments of 0.235 mm and with no filament subjected to a special performing treatment.
  • Prior art cord No.2 is also a normal three layered structure cord 1 +5+12 with core filament diameter and the inner layer diameters equal to 0.245 mm and the outer layer filaments of 0.235 mm and with no filament subjected to a special performing treatment.
  • the breaking load has been determined by a tension test.
  • the rubber penetration is determined by measuring the amount of air
  • the core filament 26a can be discerned. While originally the filaments of the inner strand are fed into the first cabling point, one of the sheath filaments 26b around the core is pushed towards the centre as core filament by varying mechanically its guiding path and the original core filament 26a is set free to act as a sheath filament. Each filament in the inner strand is circulating as the core filament in an alternating manner by the same way.
  • This cord had the following properties: the diameter was 1 .19 mm with a fairly high difference between maximum and minimum diameter of 0.01 mm, the mass per meter was 6.78 gram/m and a breaking strength 2888 N with an elongation of 2.72% was found.
  • constructions comprising only one layer around the inner strand, but that it may also be applied to constructions comprising more coaxial layers around the inner strand.

Landscapes

  • Ropes Or Cables (AREA)

Abstract

La présente invention se rapporte à un câble d'acier conçu pour le renforcement de produits en caoutchouc, comprenant un brin intérieur d'au moins trois et pas plus de sept filaments torsadés ensemble dans une première direction de torsion selon un premier pas de torsion et comprenant en outre une couche de filaments torsadés autour dudit brin intérieur dans une seconde direction de torsion selon un second pas de torsion. L'un des filaments du brin intérieur prend en alternance la position de filament central. Le rôle en alternance des filaments à servir de filament central procure un bon ancrage mécanique de ce filament central dans le câble d'acier et la couche extérieure offre une surface extérieure présentant une rugosité diminuée si bien que les problèmes d'aptitude au traitement sont évités ou au moins réduit à un minimum.
PCT/EP2011/060051 2010-06-22 2011-06-16 Câble d'acier appliqué en couches à noyau alternatif WO2011161003A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNPCT/CN2010/000915 2010-06-22
CN2010000915 2010-06-22

Publications (2)

Publication Number Publication Date
WO2011161003A2 true WO2011161003A2 (fr) 2011-12-29
WO2011161003A3 WO2011161003A3 (fr) 2012-03-08

Family

ID=44627001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/060051 WO2011161003A2 (fr) 2010-06-22 2011-06-16 Câble d'acier appliqué en couches à noyau alternatif

Country Status (1)

Country Link
WO (1) WO2011161003A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995016816A1 (fr) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Structure ouverte pour cable metallique
JPH0849177A (ja) 1994-08-08 1996-02-20 Sumitomo Rubber Ind Ltd タイヤ用のスチールコード

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2906018B2 (ja) * 1994-04-04 1999-06-14 東京製綱株式会社 ゴム補強用スチールコードおよびその製造法
JPH0874186A (ja) * 1994-08-30 1996-03-19 Sumitomo Rubber Ind Ltd タイヤ用のコード
JP3540845B2 (ja) * 1994-10-21 2004-07-07 東京製綱株式会社 ゴム補強用スチールコードおよびこれを使用したラジアルタイヤ
JPH08127986A (ja) * 1994-10-27 1996-05-21 Tokyo Seiko Co Ltd ゴム補強用スチールコードおよびこれを用いたラジアルタイヤ
US6065518A (en) * 1995-08-01 2000-05-23 Sumitomo Rubber Industries, Ltd. Heavy duty pneumatic tire with high elongation steel belt cord
JPH09268485A (ja) * 1996-01-26 1997-10-14 Tokyo Seiko Co Ltd ゴム補強用スチールコードおよびラジアルタイヤ
JPH111881A (ja) * 1997-06-11 1999-01-06 Kanai Hiroaki ゴム製品補強用スチールコードおよびその製造方法
US6745806B2 (en) * 2000-11-22 2004-06-08 Sumitomo Rubber Industries, Ltd. Radial tire for heavy load with specified metal carcass cord

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995016816A1 (fr) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Structure ouverte pour cable metallique
JPH0849177A (ja) 1994-08-08 1996-02-20 Sumitomo Rubber Ind Ltd タイヤ用のスチールコード

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BOURGOIS LUC: "Tire Reinforcement and Tire Performance", 1979, AMERICAN SOCIETY FOR TESTING AND MATERIALS, article "Survey of Mechanical Properties of Steel Cord and Related Test Methods", pages: 19 - 46

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Publication number Publication date
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